Yes, this has quickly turned into a gish gallop. Enthusiasm is not to be denied, but I am looking for something a little more disciplined than intellectual whack-a-mole, and I'm sure we all would appreciate such clarity.
The original premise involved shadows - let us find consensus there first.
Then ethos must be established - what are the rules of who is to be believed? Anticipating no consensus, I propose we pursue principles we can actually confirm ourselves through observation or experimentation, like shadow size, observing the eclipse, etc. Aristotle seems to have provoked quite a reaction - my reference to him is to someone who was doing everything he could with what he had, an example starting point more than a sensei.
Then we can address the black sun proposition. That will require robust evidence.
God Speed and Holy Sunday to all.